1 files changed, 2 insertions, 0 deletions
diff --git a/block/io.c b/block/io.c
index cfc93dc912..e97adb5ba4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2971,6 +2971,7 @@ int coroutine_fn bdrv_co_pdiscard(BdrvChild *child, int64_t offset,
     int head, tail, align;
     BlockDriverState *bs = child->bs;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!bs || !bs->drv || !bdrv_co_is_inserted(bs)) {
         return -ENOMEDIUM;
@@ -3577,6 +3578,7 @@ bdrv_co_pdiscard_snapshot(BlockDriverState *bs, int64_t offset, int64_t bytes)
     BlockDriver *drv = bs->drv;
     int ret;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!drv) {
         return -ENOMEDIUM;